Do you mean make the raffle prize, bitcoins or you buy the ticket WI h raffles? If you made the prize Bitcoin, that would just be some sort of jackpot game, but if you made a payment option Bitcoins, that could definitely work.

It would be fairly easy to implement and all you would have to do is get a wallet and then tell them to send the btc there. You can then set up something to check what transactions have been sent there.